Misc: Code cleanup

- Move some long functions to ./src/compton.c .

- Fix a small potential issue in win_set_focused() when a window with
  neither leader nor client window is focused.

- Add DEBUG_LEADER.

compton.c

@@ -2704,6 +2704,76 @@ wid_get_prop_window(session_t *ps, Window wid, Atom aprop) {
   return p;
 }
 
+/**
+ * Update focused state of a window.
+ */
+static void
+win_update_focused(session_t *ps, win *w) {
+  bool focused_old = w->focused;
+
+  w->focused = w->focused_real;
+
+  // Use wintype_focus, and treat WM windows and override-redirected
+  // windows specially
+  if (ps->o.wintype_focus[w->window_type]
+      || (ps->o.mark_wmwin_focused && w->wmwin)
+      || (ps->o.mark_ovredir_focused
+        && w->id == w->client_win && !w->wmwin)
+      || win_match(w, ps->o.focus_blacklist, &w->cache_fcblst))
+    w->focused = true;
+
+  // If window grouping detection is enabled, mark the window active if
+  // its group is
+  if (ps->o.track_leader && ps->active_leader
+      && win_get_leader(ps, w) == ps->active_leader) {
+    w->focused = true;
+  }
+
+  if (w->focused != focused_old)
+    w->flags |= WFLAG_OPCT_CHANGE;
+}
+
+/**
+ * Set real focused state of a window.
+ */
+static void
+win_set_focused(session_t *ps, win *w, bool focused) {
+  // Unmapped windows will have their focused state reset on map
+  if (IsUnmapped == w->a.map_state)
+    return;
+
+  if (w->focused_real != focused) {
+    w->focused_real = focused;
+
+    // If window grouping detection is enabled
+    if (ps->o.track_leader) {
+      Window leader = win_get_leader(ps, w);
+
+      // If the window gets focused, replace the old active_leader
+      if (w->focused_real && leader != ps->active_leader) {
+        Window active_leader_old = ps->active_leader;
+
+        ps->active_leader = leader;
+
+        group_update_focused(ps, active_leader_old);
+        group_update_focused(ps, leader);
+      }
+      // If the group get unfocused, remove it from active_leader
+      else if (!w->focused_real && leader && leader == ps->active_leader
+          && !group_is_focused(ps, leader)) {
+        ps->active_leader = None;
+        group_update_focused(ps, leader);
+      }
+
+      // The window itself must be updated anyway
+      win_update_focused(ps, w);
+    }
+    // Otherwise, only update the window itself
+    else {
+      win_update_focused(ps, w);
+    }
+  }
+}
 /**
  * Update leader of a window.
  */
@@ -2719,6 +2789,10 @@ win_update_leader(session_t *ps, win *w) {
     leader = wid_get_prop_window(ps, w->client_win, ps->atom_client_leader);
 
   win_set_leader(ps, w, leader);
+
+#ifdef DEBUG_LEADER
+  printf_dbgf("(%#010lx): client %#010lx, leader %#010lx, cache %#010lx\n", w->id, w->client_win, w->leader, win_get_leader(ps, w));
+#endif
 }
 
 /**
@@ -2752,16 +2826,6 @@ win_set_leader(session_t *ps, win *w, Window nleader) {
   }
 }
 
-/**
- * Get the leader of a window.
- *
- * This function updates w->cache_leader if necessary.
- */
-static Window
-win_get_leader(session_t *ps, win *w) {
-  return win_get_leader_raw(ps, w, 0);
-}
-
 /**
  * Internal function of win_get_leader().
  */

compton.h

@@ -17,6 +17,7 @@
 // #define DEBUG_REDIR      1
 // #define DEBUG_ALLOC_REG  1
 // #define DEBUG_FRAME      1
+// #define DEBUG_LEADER     1
 // #define MONITOR_REPAINT  1
 
 // Whether to enable PCRE regular expression support in blacklists, enabled
@@ -1423,12 +1424,19 @@ clear_cache_win_leaders(session_t *ps) {
 static win *
 find_toplevel2(session_t *ps, Window wid);
 
-static Window
-win_get_leader(session_t *ps, win *w);
-
 static Window
 win_get_leader_raw(session_t *ps, win *w, int recursions);
 
+/**
+ * Get the leader of a window.
+ *
+ * This function updates w->cache_leader if necessary.
+ */
+static inline Window
+win_get_leader(session_t *ps, win *w) {
+  return win_get_leader_raw(ps, w, 0);
+}
+
 /**
  * Return whether a window group is really focused.
  *
@@ -1538,34 +1546,8 @@ win_update_leader(session_t *ps, win *w);
 static void
 win_set_leader(session_t *ps, win *w, Window leader);
 
-/**
- * Update focused state of a window.
- */
-static inline void
-win_update_focused(session_t *ps, win *w) {
-  bool focused_old = w->focused;
-
-  w->focused = w->focused_real;
-
-  // Use wintype_focus, and treat WM windows and override-redirected
-  // windows specially
-  if (ps->o.wintype_focus[w->window_type]
-      || (ps->o.mark_wmwin_focused && w->wmwin)
-      || (ps->o.mark_ovredir_focused
-        && w->id == w->client_win && !w->wmwin)
-      || win_match(w, ps->o.focus_blacklist, &w->cache_fcblst))
-    w->focused = true;
-
-  // If window grouping detection is enabled, mark the window active if
-  // its group is
-  if (ps->o.track_leader && ps->active_leader
-      && win_get_leader(ps, w) == ps->active_leader) {
-    w->focused = true;
-  }
-
-  if (w->focused != focused_old)
-    w->flags |= WFLAG_OPCT_CHANGE;
-}
+static void
+win_update_focused(session_t *ps, win *w);
 
 /**
  * Run win_update_focused() on all windows with the same leader window.
@@ -1585,48 +1567,8 @@ group_update_focused(session_t *ps, Window leader) {
   return;
 }
 
-/**
- * Set real focused state of a window.
- */
 static inline void
-win_set_focused(session_t *ps, win *w, bool focused) {
-  // Unmapped windows will have their focused state reset on map
-  if (IsUnmapped == w->a.map_state)
-    return;
-
-  if (w->focused_real != focused) {
-    w->focused_real = focused;
-
-    // If window grouping detection is enabled
-    if (ps->o.track_leader && win_get_leader(ps, w)) {
-      Window leader = win_get_leader(ps, w);
-
-      // If the window gets focused, replace the old active_leader
-      if (w->focused_real && leader != ps->active_leader) {
-        Window active_leader_old = ps->active_leader;
-
-        ps->active_leader = leader;
-
-        group_update_focused(ps, active_leader_old);
-        group_update_focused(ps, leader);
-      }
-      // If the group get unfocused, remove it from active_leader
-      else if (!w->focused_real && leader == ps->active_leader
-          && !group_is_focused(ps, leader)) {
-        ps->active_leader = None;
-        group_update_focused(ps, leader);
-      }
-      else {
-        // The window itself must be updated anyway
-        win_update_focused(ps, w);
-      }
-    }
-    // Otherwise, only update the window itself
-    else {
-      win_update_focused(ps, w);
-    }
-  }
-}
+win_set_focused(session_t *ps, win *w, bool focused);
 
 static void
 determine_fade(session_t *ps, win *w);